Dräger Safety Ag&co. Kgaa

Jens Reermann

Achim Volmer

Michael Brodersen

An audio processing device () includes a correction microphone (), a reference microphone (), a classification unit (), an active noise cancellation (ANC) unit (), and a speaker (). The correction microphone is arranged in an area adjacent to an ear of a user of the device and picks up acoustic signals in the area and outputs same as a correction signal. The reference microphone picks up surrounding noises () from a surrounding area of the user and outputs same as a reference signal. The classification unit receives the reference signal and splits the reference signal corresponding to a spectrum and amplitude thereof into signal components of two or more classes and outputs a classified signal. The ANC unit receives and processes the correction signal based on the classified signal and outputs a corresponding audio signal. The speaker receives the audio signal and provides a corresponding acoustic signal output.

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Achim, Germany

Jens Reermann